CN1205036C - Waveform generating circuit and ink jet head drive circuit and ink jet recording device - Google Patents
Waveform generating circuit and ink jet head drive circuit and ink jet recording device Download PDFInfo
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- CN1205036C CN1205036C CN01812261.2A CN01812261A CN1205036C CN 1205036 C CN1205036 C CN 1205036C CN 01812261 A CN01812261 A CN 01812261A CN 1205036 C CN1205036 C CN 1205036C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04541—Specific driving circuit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04548—Details of power line section of control circuit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
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- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
The invention provides a waveform generating circuit and ink jet head drive circuit and ink jet recording device. An inkjet head driving circuit driving piezoelectric actuators 21 for ink ejection provided on an inkjet head H includes one D/A converter 62 that converts a digital signal into an analog voltage and outputs the analog voltage, and a waveform generating portion 64 into which an output voltage of the D/A converter 62 is input, and which generates a voltage rising waveform when the output voltage of the D/A converter 62 is larger than a predetermined potential that is midway between a maximum value and a minimum value of that output voltage, and generates a voltage rising waveform when the output voltage of the D/A converter 62 is smaller than the predetermined potential.
Description
Technical field
The invention belongs to the Waveform generating circuit that produces voltage waveform, drive the injection ink that is located at ink gun with the driver of ink-jet head of executive component and have a relevant technical field of ink-jet hair style tape deck that comprises by the ink gun of the executive component of this driver of ink-jet head driving.
Background technology
In recent years, it is well-known having the ink gun that ink sprays with executive component, and the executive component of this ink gun for example has to have the piezoelectric-actuator that electrode forms respectively on the two sides of piezoelectric element, and its formation is accommodated the part of the balancing gate pit of ink.Apply the voltage of pulse type by the electrode of giving this executive component, make the executive component distortion, also make the volume reducing of above-mentioned balancing gate pit, produce pressure like this in the balancing gate pit, this pressure makes the nozzle ejection ink droplet that is communicated with the balancing gate pit.
The above-mentioned voltage waveform that is applied on the executive component, for example as shown in Figure 8, constitute by following waveform: drop to minimum level (the first waveform P1 ' (voltage falling waveform) Vf) from earthing potential, link to each other with this first waveform P1 ' and keep the second waveform P2 ' of above-mentioned minimum level, link to each other with this second waveform P2 ' and rise to the 3rd waveform P3 ' (voltage rising waveform) of maximum potential (Vf) from above-mentioned minimum level, link to each other with the 3rd waveform P3 ' and keep the 4th waveform P4 ' of above-mentioned maximum potential, link to each other with the 4th waveform P4 ' and return to the 5th waveform P5 ' (voltage falling waveform) of earthing potential from above-mentioned maximum potential.Because this first to the 5th a series of waveform P1 ' ~ P5 ', constitute and make drops out from nozzles only spray once a driving pulse P ', this driving pulse P ' exports repeatedly with institute's fixed cycle.
Generation shown in Figure 9 drives the example of Waveform generating circuit (driver of ink-jet head) of the voltage waveform (driving pulse P ') of above-mentioned executive component.In the figure, the 101st, CPU, it has two terminals that output produces the data signal (for example 8 bits) of voltage waveform.Each digital signal output end of this CPU101 is connected with first D/A converter 102 that above-mentioned digital signal conversion is exported for positive aanalogvoltage and is above-mentioned digital signal conversion second D/A converter 103 that negative analog voltage is exported.Above-mentioned first and second D/A converter 102,103, pass through another terminal different from above-mentioned CPU101 with above-mentioned data signal, the data stabilization signal is imported, in input during this data stabilization signal, from this input through fix time (data stabilization time) afterwards (determined the output of D/A converter 102 (103) after) export above-mentioned aanalogvoltage.Replenish, above-mentioned first D/A converter 102 is connected on first power supply 106 of output positive voltage; Second D/A converter 103 is connected on the second source 107 of output negative voltage.
The lead-out terminal of above-mentioned first and second D/A converter 102,103 is connected with first and second voltage current transducer 109,110 respectively, and the above-mentioned negative analog voltage that just reaching is transformed to electric current respectively by this first and second voltage current transducer 109,110.The lead-out terminal of this first and second voltage current transducer 109,110, be connected on the current-voltage conversion amplifier 111, at this current-voltage conversion amplifier 111, each electric current by 109,110 conversion of above-mentioned first and second voltage current transducer is exaggerated, and this amplified current is transformed to voltage.Replenish, be connected first voltage current transducer 109 on the lead-out terminal of above-mentioned first D/A converter 102, be connected again on above-mentioned first power supply 106; Be connected second voltage current transducer 110 on the lead-out terminal of above-mentioned second D/A converter 103, be connected again on the above-mentioned second source 107; Above-mentioned current-voltage conversion amplifier 111 is connected again on above-mentioned first and second power supply 106,107 these two power supplys.
Above-mentioned first and second voltage current transducer 109,110 and current-voltage conversion amplifier 111, output voltage according to above-mentioned first and second D/A converter 102,103, produce the such voltage waveform of above-mentioned first to the 5th waveform P1 '～P5 ', specifically, when first D/A converter, 102 positive aanalogvoltages of output and second D/A converter, 103 output earthing potentials, produce voltage rising waveform (the 3rd waveform P3 '); When second D/A converter, 103 output negative analog voltages and first D/A converter, 102 output earthing potentials, produce voltage falling waveform (the first and the 5th waveform P1 ', P5 ').Also have, when two D/A converters 102,103 are all exported earthing potential, the waveform (the second and the 4th waveform P2 ', P4 ') of the current potential before these two earthing potential outputs is kept in generation, makes a current potential of between adjacent driving pulse P ' be maintained earthing potential simultaneously.
The above-mentioned voltage waveform that produces imposes on a plurality of executive components in the ink gun by the current amplifier 113 that formed by two transistor 113a and drive IC 114.Replenish, above-mentioned drive IC 114, has switching transistor that corresponds respectively to each executive component and be provided with etc., acceptance is from the printing signal of above-mentioned CPU101, and selection only applies above-mentioned voltage waveform to this executive component that chooses corresponding to the executive component of the nozzle that should spray ink droplet.
; in above-mentioned existing Waveform generating circuit; need to produce two D/A converters 102,103 of voltage rising waveform and falling waveform; also because will provide positive voltage to first D/A converter 102; provide negative voltage to second D/A converter 103; and need export two power supplys 106,107 of positive and negative voltage respectively, it is very high and need the problem of suitable large space to produce cost like this.Also have, because the characteristic of 102,103 of first and second D/A converters poor (departure poor), formed waveform can produce error.
Summary of the invention
The present invention invents in view of the above problems, and its purpose is: improve by structure, thereby it is made structure cheap and that save the space aforesaid Waveform generating circuit, and, obtain very stable voltage waveform.
In order to reach above-mentioned purpose, the present invention has adopted following method: D/A converter is made one, and the output voltage of this D/A converter greater than the centre of the maximum of this output voltage and minimum of a value when deciding voltage, produce a waveform in voltage rising waveform and the falling waveform, when deciding current potential, produce another waveform less than above-mentioned at the output voltage of above-mentioned D/A converter.
Specifically, in first technical scheme, as Waveform generating circuit, it comprises: is digital signal conversion the D/A converter that aanalogvoltage makes its output; Import the output voltage of above-mentioned D/A converter, also the output voltage of this D/A converter greater than the maximum of this output voltage and minimum of a value among between when deciding current potential, produce a waveform in voltage rising waveform and the falling waveform; When deciding current potential, produce the waveform generation portion of another waveform less than above-mentioned at the output voltage of above-mentioned D/A converter.
Because above-mentioned formation, with between among the maximum of the output voltage in the D/A converter and the minimum of a value to be decided current potential be that standard produces voltage rising waveform and falling waveform, so such two D/A converters of unnecessary existing circuit, and as long as a power supply of a voltage in the output plus or minus is just passable.Also have, can not produce the waveform generation error that existing circuit is produced owing to the characteristic difference between two D/A converters like that.Therefore, the cost degradation and the miniaturization of circuit can be realized, the burning voltage waveform can also be produced.
Second technical scheme comprises: in first technical scheme, have constant voltage supply and switching device.Constant voltage supply output and the equal certain voltage of decide current potential; Switching device is imported the output voltage of D/A converter and the output voltage of above-mentioned constant voltage supply under switching state, and in these two output voltages any one outputed to waveform generation portion.Above-mentioned switching device, when being imported into above-mentioned D/A converter, make the input of this switching device switch to the output voltage of this D/A converter from the output voltage of above-mentioned constant voltage supply for the data signal that makes above-mentioned waveform generation portion produce voltage rising waveform or falling waveform.
Like this, the input of switching device is during any one waveform in not producing voltage rising waveform and falling waveform, as the output voltage of constant voltage supply; When producing voltage rising waveform or falling waveform, switch to the output voltage of D/A converter from the output voltage of constant voltage supply.Its result, during any one waveform in not producing voltage rising waveform and falling waveform, even D/A converter is owing to the voltage of the reason of its characteristic difference output somewhat different than deciding current potential, also output to waveform generation portion, thereby can prevent because the misoperation of the waveform generation portion that the above such D/A converter characteristic difference is taken place from the constant voltage supply that can export correct voltage.
The 3rd technical scheme comprises: in above-mentioned second technical scheme, switching device after the output of D/A converter is determined, switches to the input of this switching device the output voltage of this D/A converter from the output voltage of constant voltage supply.
That is to say, because from the input of data stabilization signal up to the output of determining D/A converter during that, become with its output voltage and characteristic, so if there be not switching device, even or switching device arranged, also the input of switching device is switched to the output voltage of D/A converter before the output of D/A converter has been determined, deviation will appear in the moment (output time) that is produced voltage rising waveform or falling waveform by waveform generation portion.; in the present invention; because after the output of D/A converter is determined the input of switching device switch to D/A converter output voltage, so in substantially when its switching device input switching, generation, output voltage rising waveform or falling waveform.Therefore, can prevent because the waveform generation that variation the brought deviation constantly of time is determined in the output of D/A converter.
The 4th technical scheme is to be located at the technical scheme of driver of ink-jet head that ink in the ink gun sprays the executive component of usefulness about driving, comprising: D/A converter and waveform generation portion.Above-mentioned D/A converter is digital signal conversion that analog signal is exported; Above-mentioned waveform generation portion imports the output voltage of above-mentioned D/A converter, and the output voltage of this D/A converter greater than the maximum of this output voltage and minimum of a value among between when deciding voltage, produce a waveform in voltage rising waveform and the falling waveform and output in the above-mentioned executive component; And at the output voltage of above-mentioned D/A converter less than above-mentioned when deciding current potential, produce another waveform and output in the above-mentioned executive component.
Because this technical scheme can access the identical action effect of above-mentioned first technical scheme.
The 5th technical scheme comprises: in the 4th technical scheme, be provided with constant voltage supply and switching device.The output of this constant voltage supply and above-mentioned decide current potential equal decide voltage, this switching device is imported the output voltage of D/A converter and the output voltage of above-mentioned constant voltage supply under switching state, and outputs to waveform generation portion to one in these two output voltages.Above-mentioned switching device, when being imported into above-mentioned D/A converter, make the input of this switching device switch to the output voltage of this D/A converter from the output voltage of above-mentioned constant voltage supply for the data signal that makes above-mentioned waveform generation portion produce voltage rising waveform or falling waveform.
Like this, can access and the identical action effect of above-mentioned second technical scheme.
The 6th technical scheme comprises: in above-mentioned the 5th technical scheme, switching device after the output of having determined D/A converter, switches to the input of this switching device the output voltage of this D/A converter from the output voltage of constant voltage supply.
Like this, can access and the identical action effect of above-mentioned the 3rd technical scheme.
The 7th technical scheme is the technical scheme about ink-jet hair style tape deck, comprises in this technical scheme: have the balancing gate pit of filling ink, the nozzle that is communicated with this balancing gate pit, because voltage application makes ink above-mentioned balancing gate pit in from the ink gun of the executive component of said nozzle injection; The element that relatively moves that above-mentioned ink gun and recording medium are relatively moved; Drive the driver of ink-jet head of the executive component of above-mentioned ink gun.Above-mentioned driver of ink-jet head has: is digital signal conversion the D/A converter that aanalogvoltage is exported; Import the output voltage of this D/A converter, and the output voltage of this D/A converter greater than the middle place of the maximum of this output voltage and minimum of a value when deciding voltage, produce a waveform in voltage rising waveform and the falling waveform and output to above-mentioned executive component,, produce another waveform and output to the waveform generation portion of above-mentioned executive component less than above-mentioned when deciding current potential at the output voltage of above-mentioned D/A converter.When ink gun relatively moves by the above-mentioned element relative record medium that relatively move, the voltage waveform that the waveform generation portion of above-mentioned driver of ink-jet head is produced outputs to above-mentioned executive component, so just ink is carried out record from the nozzle ejection of above-mentioned ink gun to recording medium.
Because the present invention, can easily obtain not only small-sized but also low-cost, and the good again ink-jet hair style tape deck of ink jet performance.
Present invention can be applied to have installed and be applied on the inkjet recording device of executive component that potential pulse removes to drive other elements, have especially and spray ink with on the ink-jet hair style tape deck of executive component, because can realize the cost degradation and the miniaturization of circuit, simultaneously can produce very stable voltage waveform, so on industry, utilize possibility very high.
Description of drawings
Fig. 1 is an approximate vertical view, shows the related ink-jet hair style tape deck of embodiments of the invention.
Fig. 2 is a cutaway view, shows the section of ink-jet hair style tape deck when main scanning direction cuts off among Fig. 1.
Fig. 3 is a schematic circuit diagram, shows the 1st example of the driver of ink-jet head of the piezoelectric-actuator that drives the ink injection usefulness that is located in the ink gun.
Fig. 4 is an oscillogram, shows an example of the voltage waveform that imposes on piezoelectric-actuator.
Fig. 5 is the timetable when the related ink-jet hair style drive circuit of the 1st example produces voltage waveform among Fig. 4.
Fig. 6 is a schematic circuit diagram, shows the 2nd example of ink-jet hair style drive circuit.
Fig. 7 is the timetable when the related ink-jet hair style drive circuit of the 2nd example produces voltage waveform among Fig. 4.
Fig. 8 is an oscillogram, shows an example of the voltage waveform that existing ink-jet hair style drive circuit produced.
Fig. 9 is a schematic circuit diagram, shows existing ink-jet hair style drive circuit.
Preferred forms
Fig. 1 is an overview diagram, shows the related ink-jet hair style tape deck of embodiments of the invention.This ink-jet hair style tape deck, such as described later, have and spray ink to as the ink gun H on the record-paper 51 of recording medium.This ink gun H is by balladeur train 31 fixing, supports; This balladeur train 31 is provided with carriage motor, does not show; Utilize this carriage motor, make above-mentioned ink gun H and balladeur train 31 carry out back and forth movement in the direction at the balladeur train axle 32 that extends along main scanning direction (directions X among Fig. 1).Utilize this balladeur train 31, balladeur train axle 32 and carriage motor to constitute the relative moving part that ink gun H and record-paper 51 are relatively moved.
Above-mentioned record-paper 51, be sandwiched between two conveying rollers 52 of the conveying motor rotation driving of not showing, utilize this conveying motor and each conveying roller 52, carry above-mentioned record-paper 51 along sub scanning direction (the Y direction among Fig. 1) perpendicular to above-mentioned main scanning direction at the downside of above-mentioned ink gun H.
As shown in Figure 2, above-mentioned ink gun H has: form the nozzle body 1 that a plurality of balancing gate pits with the jet 2b that the supply port of ink 2a is provided and sprays ink use recess 2.Each recess 2 in this nozzle body 1, this above nozzle body 1 along above-mentioned main scanning direction opening, on above-mentioned sub scanning direction, draw back approximately equalised spacing parallel arranging mutually.
The side wall portion of each recess 2 of above-mentioned nozzle body 1, the balancing gate pit's parts 5 that are about the photosensitive glass system of 200 μ m by thickness constitute; The bottom wall portion of each recess 2 is made of the ink flow path parts 6 that are fixed on these balancing gate pit's parts 5 and bonding many stainless sheet steels.In these ink flow path parts 6, be formed with the supply ink flow path 7 that is connected with the supply unit 2a of above-mentioned each recess 2 respectively, with the injection that is connected with above-mentioned jet 2b respectively ink flow path 8.Above-mentioned each supply with ink flow path 7, be connected on the providing ink chamber 10 that (sub scanning direction) extends in the orientation of above-mentioned each recess 2; This providing ink chamber 10 is connected to by being formed in above-mentioned balancing gate pit component parts 5 and the ink flow path parts 6 and with the providing ink hole 11 that unshowned ink tube is connected and is connected.
The side opposite with balancing gate pit's component parts 5 in above-mentioned ink flow path parts 6 (below) on, be formed with constitute ink gun H below, and the nozzle plate 13 of the about 20 μ m of thickness that become by macromolecule resin-shaped such as polyimides, be formed with on this nozzle plate 13 by above-mentioned each spray the nozzle bore 14 that the thickness that is connected with above-mentioned each jet 2b respectively with ink flow path 8 is about 20 μ m.This each nozzle bore 14 is disposing like that along the arrangement of sub scanning direction row shape.
The side opposite of the balancing gate pit of above-mentioned nozzle body 1 parts 5 with ink flow path parts 6 (above) on, be respectively equipped with each recess 2 that covers above-mentioned nozzle body 1, and constitute the piezoelectric-actuator 21 of balancing gate pit 3 with this recess 2.This each piezoelectric-actuator 21 has: the thickness that is made of lead zirconate titanate (PZT) is the piezoelectric layer 23 of 1～10 μ m; The thickness with above-mentioned balancing gate pit 3 opposite sides (upside) that is located at this piezoelectric layer 23 is the Pt system top electrode layer 24 of 0.05～0.6 μ m; The thickness that is located at above-mentioned balancing gate pit 3 one sides (downside) of piezoelectric layer 23 is the Cr system lower electrode layer 22 of 1～10 μ m.This lower electrode layer 22 is shared one of whole piezoelectric-actuator 21, when being in ground state, also has the effect as so-called oscillating plate.
Driving is located at first example that the ink on the above-mentioned ink gun H sprays the driver of ink-jet head (Waveform generating circuit) of using piezoelectric-actuator 21, is illustrated on Fig. 3.The related driver of ink-jet head of this first example comprises: CPU61, and it has the terminal that output is used to produce the data signal (for example 8 bits) of voltage waveform; Be connected digital signal output end of this CPU61, and be above-mentioned digital signal conversion the D/A converter 62 that aanalogvoltage is exported; Import the output voltage (aanalogvoltage) of this D/A converter 62, and, produce voltage waveform as described later like that, output to the waveform generation portion 64 of above-mentioned piezoelectric-actuator 21 according to this output voltage.
Above-mentioned D/A converter 62, from above-mentioned CPU61, by another terminal input data stabilization signal different with the above-mentioned data signal of output, when this data stabilization signal of input, through fix time (data stabilization time: change) back (after having determined the output of D/A converter 62), export above-mentioned aanalogvoltage from this input according to output voltage.Above-mentioned D/A converter 62 connects the power supply 66 of exporting positive voltage V1, utilizes above-mentioned data signal, can export the voltage of output voltage V 1 this scope from earthing potential to this power supply 66.
The lead-out terminal of above-mentioned D/A converter 62 connects above-mentioned waveform generation portion 64.This waveform generation portion 64 has: will be transformed to the voltage current transducer 64a of electric current from the aanalogvoltage that above-mentioned D/A converter 62 outputs come; Electric current by this voltage current transducer 64a conversion, by amplifying (magnifying power is by the resistance ratio decision of above-mentioned two resistance) by two resistance and two current mirroring circuits that transistor constituted, and this amplified current is transformed to the current-voltage conversion amplifier 64b of voltage by capacitor.Replenish, above-mentioned voltage current transducer 64a and current-voltage conversion amplifier 64b with the same with above-mentioned D/A converter 62, are connected on the power supply 66.
Above-mentioned waveform generation portion 64, the output voltage of above-mentioned D/A converter 62 greater than the maximum (V1) of this output voltage and minimum of a value (earthing potential) among between decide current potential V2 (in the present embodiment, V2 is the midpoint potential (V1/2) of maximum and minimum of a value, but only be positioned at the current potential of the centre of maximum and minimum of a value, any potential value can) time, produce the voltage rising waveform, at the output voltage of above-mentioned D/A converter 62 less than above-mentioned when deciding current potential V2, generation voltage falling waveform.Also have, by above-mentioned when decide current potential V2, produce and keep this institute and decide current potential V2 and face the waveform of exporting that current potential before at the output voltage of D/A converter 62.
The lead-out terminal of above-mentioned waveform generation portion 64 by current amplifier 68 and the drive IC 69 that two transistor 68a are constituted, is connected on the top electrode layer 24 of each piezoelectric-actuator 21 of ink gun H.This drive IC 69 has the switching transistor that corresponding each piezoelectric-actuator 21 disposed etc., it accepts the printing signal from above-mentioned CPU61, and selection is corresponding to the piezoelectric-actuator 21 of the nozzle 14 that should spray ink droplet, and above-mentioned waveform generation portion 64 the voltage waveform that produces, export, only impose on this executive component 21 of having selected.
Impose on the voltage waveform of above-mentioned each piezoelectric-actuator 21, for example shown in Figure 4, constitute by following waveform: the first waveform P1 (voltage falling waveform) that drops to minimum level from the intermediate potential Vb between maximum potential (Va) and the minimum level (earthing potential); Connect this first waveform P1, and keep the second waveform P2 of above-mentioned minimum level; Connect this second waveform P2, and rise to the 3rd waveform P3 (voltage rising waveform) of maximum potential from above-mentioned minimum level; Connect the 3rd waveform P3, and keep the 4th waveform P4 of above-mentioned maximum potential; Connect the 4th waveform P4, and return to the 5th waveform P5 (voltage falling waveform) of above-mentioned intermediate potential Vb from above-mentioned maximum potential.By this first to the 5th a series of waveform P1～P5, constitute for once and spray desired 1 the driving pulse P of ink droplet from nozzle 14, this driving pulse P with institute's fixed cycle (for example about 50 μ s: driving frequency 20kHz) repeatedly output (current potential between adjacent driving pulse P is maintained above-mentioned intermediate potential Vb).That is to say that this driving pulse P is to be draw-pushing away-pull-up (pull-push-pull type) of standard with above-mentioned intermediate potential Vb.
Secondly, with reference to figure 5, the action when the related driver of ink-jet head of the 1st example is produced above-mentioned first to the 5th waveform P1～P5 describes.
Stage before producing waveform, will make above-mentioned data signal of being decided current potential V2 to D/A converter 62 with the output voltage of this D/A converter 62 from CPU61 output, like this, the above-mentioned intermediate potential Vb of waveform generation portion 64 outputs.
Then, to be decided current potential V2 (in the present embodiment less than above-mentioned with the output voltage values of this D/A converter 62 from CPU61 output, the minimum of a value of output voltage (earthing potential)) data signal and data stabilization signal (establishing the state of exporting the data stabilization signal among Fig. 5 is the Lo state) are in D/A converter 62, in D/A converter 62, after input above-mentioned the fixing time of process (the t time Fig. 5) of this data stabilization signal, just determine its output, export above-mentioned data signal and be transformed to the aanalogvoltage of simulation (in Fig. 5, the state that to export aanalogvoltage (except that deciding current potential V2) is the Lo state, exporting decide current potential V2 state be the Hi state).Because the output of this aanalogvoltage, waveform generation portion 64 utilizes current-voltage conversion amplifier 64b, the first waveform P1 that produce, output drops to minimum level from middle current potential Vb.Replenish, determine before the output of D/A converter 62, receive printing signal from CPU61, drive IC 69 is selected the piezoelectric-actuator 21 corresponding with the nozzle 14 that should spray ink droplet, and the switching transistor corresponding with this selected piezoelectric-actuator 21 is set at on-state, and allows this state proceed to have produced after the 5th waveform P5.
Then, after having produced the above-mentioned first waveform P1, from CPU61 output will with the output voltage of this D/A converter 62 as above-mentioned data signal of decide current potential V2 to D/A converter 62, like this, 64 generations of waveform generation portion, export the second waveform P2 that keeps minimum level.
Secondly, to be decided the value of current potential V2 (the present embodiment greater than above-mentioned with the output voltage of D/A converter 62 from CPU61 output, the maximum V1 of output voltage) data signal and data stabilization signal have been determined after the output of D/A converter 62 in D/A converter 62, the output aanalogvoltage.Because the output of this aanalogvoltage, waveform generation portion 64 utilizes the 3rd waveform P3 that its current-voltage conversion amplifier 64b produces, output rises to maximum potential from minimum level.
Produced after above-mentioned the 3rd waveform P3, to be decided the data signal of current potential V2 to D/A converter 62 as above-mentioned with the output voltage of this D/A converter 62 from CPU61 output, since this signal, the 4th waveform P4 that waveform generation portion 64 produces, maximum potential is kept in output.
Then, from CPU61 output will be with the output voltage of this D/A converter 62 data signal of minimum of a value and data stabilization signal to D/A converter 62, determined after the output of D/A converter 62 the output aanalogvoltage.Because the output of this aanalogvoltage, waveform generation portion 64 is by the 5th waveform P5 that its current-voltage conversion amplifier 64b produces, output drops to intermediate potential from maximum potential.
Produced after above-mentioned the 5th waveform P5, to be decided the data signal of current potential V2 to D/A converter 62 as above-mentioned with the output voltage of this D/A converter 62 from CPU61 output, like this, waveform generation portion 64 drives between the P up to producing again, exports above-mentioned intermediate potential Vb always.
At this, the action of above-mentioned ink gun H is described.If by above-mentioned waveform generation portion 64 the first waveform P1 that produces, export be applied to piezoelectric-actuator 21, piezoelectric layer 23 is just because the electric field that is produced in this piezoelectric layer 23, along direction elongation perpendicular to its thickness direction, in contrast to this, lower electrode layer 22 and top electrode layer 24 are not extended, promptly under the effect of so-called bimetallic effect, piezoelectric-actuator 21 corresponding to that part of balancing gate pit 3 just toward a side convex curvature, the distortion opposite with balancing gate pit 3.
Then, after the 3rd waveform P3 was applied to piezoelectric-actuator 21, piezoelectric layer 23 shrank, that a part of a side convex curvature, distortion toward balancing gate pit 3 corresponding to balancing gate pit 3 of piezoelectric-actuator 21.Since this flexural deformation, generation pressure in balancing gate pit 3, under the effect of this pressure, the institute in the ink in the balancing gate pit 3 quantitatively is ejected into record-paper 51 with ink flow path 8 from nozzle 14 with spraying through above-mentioned jet 2b, and point-like is attached on the record-paper 51.
Then, after the 5th waveform P5 was applied to piezoelectric-actuator 21, piezoelectric layer 23 prolonged and that part corresponding to balancing gate pit 3 of piezoelectric-actuator 21 returns to original state.Applying the above-mentioned first and the 5th waveform P1, during P5,10 process supplies are filled in the balancing gate pit 3 with ink flow path 7 and supply port 2a ink from above-mentioned providing ink chamber.
Under certain substantially speed, when making ink gun H and balladeur train 31 end of 51 moving to the other end along main scanning direction from record-paper, under the output cycle of above-mentioned driving pulse P, repeat voltage waveform is imposed on piezoelectric-actuator 21 (still, ink gun H arrive ink droplet do not need to drop on the record-paper 51 local time, because the effect of above-mentioned drive IC 69 does not apply), like this ink droplet is dropped on institute's allocation of record-paper 51.After the record end of a scanning, the limit makes ink gun H and balladeur train 31 move the limit from injector head H injection ink droplet, the record that carries out a scanning again along main scanning direction again.By moving repeatedly, on whole record-paper 51, form desired image.
So, in the related driver of ink-jet head of above-mentioned the 1st example, because by with between among the maximum of the output voltage of a D/A converter 62 and the minimum of a value to be decided current potential V2 be that standard produces voltage and rises and falling waveform, so do not need such two the D/A executive components of existing circuit, and, do not export the power supply of negative voltage, as long as the power supply 66 of an output positive voltage is just passable.Can not produce available circuit like that because the waveform generation error that the characteristic between two D/A executive components poor (departure poor) is produced yet.Its result can seek the cost degradation and the miniaturization of circuit, can produce very stable voltage waveform simultaneously.So, can obtain at an easy rate not only small-sized but also low-cost, and the also very good ink-jet hair style tape deck of ink jet performance.
Fig. 6 shows the related driver of ink-jet head of the 2nd embodiment and (replenishes, the part identical with Fig. 3 added the symbol identical with Fig. 3, omitted its detailed description), between D/A converter 62 and waveform generation portion 64, be provided with analog switch 71 as switching device.
The 2nd example is provided with output and the above-mentioned constant voltage supply 72 of deciding the equal certain voltage of current potential V2, above-mentioned analog switch 71, because working signal from CPU61, under switching state, import the output voltage of above-mentioned D/A converter 62 and the output voltage of above-mentioned constant voltage supply 72, and make in these two output voltages any one output to waveform generating unit 64.Specifically, when waveform generation portion 64 does not produce any one waveform in voltage rising waveform and the falling waveform (because waveform generation portion 64, do not import the data signal in D/A converter 62 time that produces voltage rising waveform or falling waveform), the input of above-mentioned analog switch 71 is used as the output voltage (making analog switch 71 become the state shown in the solid line among Fig. 6) of constant voltage supply 72; When being imported into D/A converter 62 for the data signal that makes waveform generation portion 64 produce voltage rising waveform or falling waveform (when the data signal that from CPU6 1 will be maximum or minimum of a value with the output voltage is input to the D/A converter 62), the input of above-mentioned analog switch 71 switches to the output voltage (making analog switch 71 make the state shown in the double dot dash line Fig. 6) of D/A converter 62 from the output voltage of constant voltage supply 72.This imports switching, for the data signal that makes waveform generation portion 64 produce voltage rising waveform or falling waveform is transfused to, has determined that the output of D/A converter 62 is just carried out afterwards.
Replenish, D/A converter 62, by another terminal different with data signal and data stabilization signal, from CPU61 input and latch signal, the output state of aanalogvoltage is kept in the input of this latch signal.
Below, explanation produces the action of the related driver of ink-jet head of the 2nd example of above-mentioned first to the 5th waveform P1～P5 on Fig. 7.
Stage before waveform generation, the working signal (the Hi state among Fig. 7) that analog switch 71 is accepted from CPU61, make constant voltage supply 72 and waveform generation portion 64 be connection status, under this state, in waveform generation portion 64, imported the output voltage of constant voltage supply 72.Because it is equal that the output voltage of this constant voltage supply 72 and institute decide current potential V2, thus waveform generation portion 64, the same intermediate potential Vb that exports with above-mentioned the 1st example.
Then, from CPU61 output will be that the data signal of minimum of a value and data stabilization signal are to D/A converter 62 with the output voltage of this D/A converter 62, in D/A converter 62, determine its output in input through fix time back from this data stabilization signal, just export aanalogvoltage then.Replenish, keep this output state by above-mentioned latch signal.
Determined the output of D/A converter 62 and exported after the aanalogvoltage (from the input of data stabilization signal through the maximum of being longer than the data stabilization time a little after), the input of analog switch 71 switches to the output voltage of D/A converter 62 by the working signal (the Lo state among Fig. 7) from CPU61 from the output voltage of constant voltage supply 72.Like this, D/A converter 62 and waveform generation portion 64 become connection status, and above-mentioned aanalogvoltage is input to waveform generation portion 64, and its result is identical with above-mentioned the 1st example, and waveform generation portion produces, the output first waveform P1.Replenish, in this 2nd example, drive IC 69, substantially when the input of above-mentioned analog switch 71 is switched in, selected switching transistor corresponding to piezoelectric-actuator 21 is made as on-state, is maintained to and has produced the identical substantially moment of the 5th waveform P5.
After this, substantially when having produced the first waveform P1 in, the input of analog switch 71 switches to the output voltage of constant voltage supply 72 from the output voltage of D/A converter 62, like this, waveform generation portion 64 produces, the output second waveform P2.Replenish, substantially when the generation of the first waveform P1 finishes in or finish after, remove because the output state of the D/A converter 62 that latch signal is kept.
Then, from CPU61 output will be with the output voltage of this D/A converter 62 peaked data signal and data stabilization signal to D/A converter 62, determined just to export aanalogvoltage after the output of D/A converter 62.Determined the output of D/A converter 62 and exported after the aanalogvoltage (from the input of data stabilization signal through the maximum of being longer than the data stabilization time a little after), the input of analog switch 71 just switches to the output voltage of D/A converter 62 from the output voltage of constant voltage supply 72.Like this, D/A converter 62 and waveform generation portion 64 become connection status, and above-mentioned aanalogvoltage is input to waveform generation portion 64, and waveform generation portion 64 produces, output the 3rd waveform P3.
After this, substantially when having produced the 3rd waveform P3 in, the input of analog switch 71 switches to the output voltage of constant voltage supply 72 from the output voltage of D/A converter 62, like this, waveform generation portion 64 produces, output the 4th waveform P4.
Then, from CPU61 output will be with the output voltage of this D/A converter 62 data signal of minimum of a value and data stabilization signal to D/A converter 62, determined just to export aanalogvoltage after the output of D/A converter 62.Determine the output of D/A converter 62 and exported after the aanalogvoltage (from the input of data stabilization signal through the maximum of being longer than the data stabilization time a little after), the input of analog switch 71 switches to the output voltage of D/A converter 62 from the output voltage of constant voltage supply 72.Like this, waveform generation portion 64 produces, exports the 5th waveform P5.
Then, in substantially when having produced the 5th waveform P5, the input of analog switch 71 switches to the output voltage of constant voltage supply 72 from the output voltage of D/A converter 62, like this, waveform generation portion 64 is producing the above-mentioned intermediate potential Vb of output between the driving pulse P next time.
Replenish, during that of the output voltage of analog switch 71 input constant voltage supplies 72, the output voltage of D/A converter 62 both can be by having been decided current potential V2 as above-mentioned the 1st example, can be other current potentials of earthing potential etc. again.
So, in the related driver of ink-jet head of above-mentioned the 2nd example, during any waveform in not producing voltage rising waveform and falling waveform (by waveform generation portion 64, when not importing the data signal that produces voltage rising waveform or falling waveform), because the input of analog switch 71 is as the output voltage of constant voltage supply 72, thus decide current potential V2 and D/A converter 62 output voltage irrespectively output to waveform generation portion 64 from constant voltage supply 72.That is to say, even from CPU61 exported will with the output voltage of this D/A converter 62 as decided the data signal of current potential V2 to D/A converter 62, because its characteristic deviation, the output of D/A converter 62 might be staggered a little from deciding current potential V2, but in this 2nd example, because decide current potential V2 and output to the waveform generation portion 64 from the constant voltage supply 72 of exportable correct voltage, so can prevent because the misoperation of the waveform generation portion 64 that characteristic deviation caused of D/A converter 62.The inkjet performance that can realize ink-jet hair style tape deck like this improves.
Also have, when producing voltage rising waveform or falling waveform by waveform generation portion 64 (is being by waveform generation portion 64, when the data signal of generation voltage rising waveform or falling waveform is input in the D/A converter 62), the input of analog switch 71 is switched to the output voltage of D/A converter 62 from the output voltage of constant voltage supply 72, at this moment, because after the output of determining D/A converter 62, just carry out the input of switching analoging switch 71, so can produce constantly by analog switch 71 control waveforms.That is to say, because its output voltage and characteristic deviation, the time (t that fixes time) of determining the output of D/A converter 62 from being input to of data stabilization signal also can change, so if do not having analog switch 71 or even analog switch 71 arranged, also before the output of D/A converter 62 is determined, the input of analog switch 71 is switched to the output voltage of D/A converter 62, and waveform generation portion 64 produces, the voltage rising waveform of output or falling waveform constantly deviation will occur.; in the 2nd example; because after the output of determining D/A converter 62, the input of analog switch 71 is switched to the output voltage of D/A converter 62, so in the input switching of analog switch 71, can produce substantially, output voltage rising waveform or falling waveform.As a result, can prevent that the output of D/A converter 62 from determining that deviation appears in waveform generation that time fluctuation brings constantly, and when certain, inscribe generation, output voltage waveforms always.Therefore, it is quite little that the deviation of ink emitted dose is become, and can improve the precision of ink droplet lowering position simultaneously on record-paper 51, can access high image quality.
Replenish, in above-mentioned the 2nd example, after the output of having determined D/A converter 62, just the input of analog switch 71 is switched to the output voltage of D/A converter 62 from the output voltage of constant voltage supply 72, also can be before the output of having determined D/A converter 62 (for example, when the data signal that is produced voltage rising waveform or falling waveform by waveform generation portion 64 is input in the D/A converter 62), the input of analog switch 71 is switched to the output voltage of D/A converter 62.Like this, also can prevent because the misoperation of the waveform generation portion 64 that characteristic deviation caused of D/A converter 62., from improving precision this purpose of ink droplet lowering position, preferably adopt the method for above-mentioned the 2nd example.
In the above-described embodiments, adopted draw-to push away-pull-up driving pulse P, the present invention also goes for having the pushing away of a voltage rising waveform and a falling waveform-pull-up, draw-pushes away type.
Also have, in the above-described embodiments, waveform generation portion 64 following formations: at the output voltage of D/A converter 62 during greater than deciding current potential V2, its generation voltage rising waveform; Less than above-mentioned when deciding current potential V2, its produces voltage falling waveform at the output voltage of above-mentioned D/A converter 62.It can also followingly constitute: during greater than deciding current potential V2, its produces voltage falling waveform at the output voltage of D/A converter 62; Less than above-mentioned when deciding current potential V2, its produces voltage rising waveform at above-mentioned D/A converter 62.
Say again, in the above-described embodiments, Waveform generating circuit is applicable to the driver of ink-jet head of the piezoelectric-actuator 21 among the ink gun H that drives ink-jet hair style tape deck, anyly apply potential pulse and the circuit that drives can both be suitable for Waveform generating circuit of the present invention with voltage rising waveform and falling waveform.
Claims (4)
1. a driving is located at the driver of ink-jet head that ink in the ink gun sprays the executive component of usefulness, wherein:
It comprises:
Is digital signal conversion the D/A converter that aanalogvoltage is exported, and
Import the output voltage of above-mentioned D/A converter, and the output voltage of this D/A converter greater than the maximum of this output voltage and minimum of a value among between when deciding voltage, produce a waveform in voltage rising waveform and the falling waveform and output on the above-mentioned executive component; And at the output voltage of above-mentioned D/A converter less than above-mentioned when deciding current potential, produce another waveform and output to waveform generation portion on the above-mentioned executive component.
2. driver of ink-jet head according to claim 1, wherein:
Comprise:
Output and the above-mentioned constant voltage supply of deciding the equal certain voltage of current potential, and
The output voltage of input D/A converter and the output voltage of above-mentioned constant voltage supply under switching state, and a switching device that outputs to waveform generation portion in these two output voltages;
Above-mentioned switching device, when being imported into above-mentioned D/A converter, make the input of this switching device switch to the output voltage of this D/A converter from the output voltage of above-mentioned constant voltage supply for the data signal that makes above-mentioned waveform generation portion produce voltage rising waveform or falling waveform.
3. Waveform generating circuit according to claim 2, wherein:
Switching device after the output of having determined D/A converter, switches to the input of this switching device the output voltage of this D/A converter from the output voltage of constant voltage supply.
4. ink-jet hair style tape deck, wherein:
It comprises:
The balancing gate pit of filling ink, the nozzle that is communicated with this balancing gate pit, because voltage application makes ink above-mentioned balancing gate pit in from the ink gun of the executive component of said nozzle injection,
The element that relatively moves that above-mentioned ink gun and recording medium are relatively moved,
Drive the driver of ink-jet head of the executive component of above-mentioned ink gun;
Above-mentioned driver of ink-jet head has: is digital signal conversion the D/A converter that aanalogvoltage is exported; Import the output voltage of this D/A converter, and the output voltage of this D/A converter greater than the middle place of the maximum of this output voltage and minimum of a value when deciding voltage, produce a waveform in voltage rising waveform and the falling waveform and output on the above-mentioned executive component,, produce another waveform and output to the waveform generation portion of above-mentioned executive component less than above-mentioned when deciding current potential at the output voltage of above-mentioned D/A converter;
When ink gun relatively moves by the above-mentioned element relative record medium that relatively move, the voltage waveform that the waveform generation portion of above-mentioned driver of ink-jet head is produced outputs on the above-mentioned executive component, so just ink is carried out record from the nozzle ejection of above-mentioned ink gun to recording medium.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000324011 | 2000-10-24 | ||
| JP324011/2000 | 2000-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1440332A CN1440332A (en) | 2003-09-03 |
| CN1205036C true CN1205036C (en) | 2005-06-08 |
Family
ID=18801605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01812261.2A Expired - Fee Related CN1205036C (en) | 2000-10-24 | 2001-10-24 | Waveform generating circuit and ink jet head drive circuit and ink jet recording device |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6830302B2 (en) |
| JP (1) | JPWO2002034528A1 (en) |
| CN (1) | CN1205036C (en) |
| WO (1) | WO2002034528A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3821231B2 (en) * | 2003-01-27 | 2006-09-13 | セイコーエプソン株式会社 | Liquid ejecting head driving method and liquid ejecting apparatus |
| JP2011148122A (en) * | 2010-01-19 | 2011-08-04 | Seiko Epson Corp | Printing device and printing method |
| WO2011093889A1 (en) | 2010-01-29 | 2011-08-04 | Hewlett-Packard Development Company, L.P. | Crosstalk reduction in piezo printhead |
| EP2569160B1 (en) | 2010-05-14 | 2020-05-06 | Hewlett-Packard Development Company, L.P. | Switchable feedback damping of drop-on-demand piezoelectric fluid-ejection mechanism |
| JP6528391B2 (en) * | 2014-11-25 | 2019-06-12 | セイコーエプソン株式会社 | Liquid discharge apparatus, head unit, integrated circuit device for driving capacitive load, and capacitive load drive circuit |
| JP6572645B2 (en) * | 2015-07-01 | 2019-09-11 | セイコーエプソン株式会社 | Liquid ejection device |
| JP6836120B2 (en) * | 2016-08-08 | 2021-02-24 | セイコーエプソン株式会社 | Liquid discharge device and drive circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3503656B2 (en) * | 1993-10-05 | 2004-03-08 | セイコーエプソン株式会社 | Drive unit for inkjet head |
| JP3552449B2 (en) * | 1997-03-12 | 2004-08-11 | セイコーエプソン株式会社 | Method and apparatus for driving ink jet print head |
-
2001
- 2001-10-24 US US10/297,425 patent/US6830302B2/en not_active Expired - Fee Related
- 2001-10-24 JP JP2002537550A patent/JPWO2002034528A1/en active Pending
- 2001-10-24 CN CN01812261.2A patent/CN1205036C/en not_active Expired - Fee Related
- 2001-10-24 WO PCT/JP2001/009352 patent/WO2002034528A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002034528A1 (en) | 2002-05-02 |
| JPWO2002034528A1 (en) | 2004-03-04 |
| US20040032436A1 (en) | 2004-02-19 |
| CN1440332A (en) | 2003-09-03 |
| US6830302B2 (en) | 2004-12-14 |
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